-4
我有以下几类（多对多关系）：SQL INNER JOIN不存在
+ post
post_tag
+ tag
post_category
+ category
如何创建SQL查询，以检查其标签中没有类别帖子？
谢谢！
A
回答
3
select distinct pt.tagname
from post_tag pt
where not exists
(
select *
from post_category pc
where pc.post_id = pt.post_id
)
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你能告诉我们你的表结构吗？ – Mari